Why do some men like my husband have the wife watching fantasy where he watches wife w/other man?

No your husband is not the only one. My husband has that fantasy as well. I made the mistake of fulfilling his fantasy. I wouldn't make him feel bad for his fantasy though. I don't think he is sick and I don't think my husband is sick either. Men are very visual beings and I think that has a lot to do with it, but I started having feelings for the man I was with and almost lost my husband. I think that's what men don't get is that women are emotional and we connect with love. My advice is keep it to role playing. Bringing another man into the bedroom is just asking for trouble.